auto im guessing, my lx would do this i dropped the pan, changed the filter and new gasket, make sure you use the new gaskets and that there all there, i got mine from az and one of the gaskets was missing. Didnt realize that and it was still slipping so dropped it again and noticed a missing gasket. Re-assembled it, filled it back up with fluid added lucas and car ran perfect till it got totaled! If you have a manual then probably servos or something!! Not an expert but thats my experience!